2:20 p.m. Sept. 8 update: Tonight's Pentatonix concert at Ruoff Home Mortgage Music Center has been postponed due to "considerable unsafe weather," according to a statement from Live Nation. The show has been rescheduled for this Wednesday, Sept. 12. All tickets for tonight's show will be honored.

11:14 a.m. Sept. 8 update: Saturday morning the Indianapolis Motor Speedway announced the cancellation of the Florida Georgia Line Festival as well as all on-track activities at IMS. The Brickyard 400 has been moved to to 1 p.m. Sunday and Xfinity Series Lilly Diabetes 250 to 10 a.m. on Monday.

ORIGINAL STORY: Widespread showers, thunderstorms and heavy rain are expected through the weekend, bringing a risk of flash floods and dampening the outlook for outdoor events in Central Indiana.

The National Weather Service in Indianapolis on Friday issued a flash flood watch for all of Central Indiana that lasts until Sunday night.